Asking whether or not an ecological community displays the structural
property of nestedness is becoming increasingly common in ecological research. We
note, however, a currently limited understanding of how individual matrix
components (e.g. species as rows and sites as columns) and elements (e.g. a
species’ occurrence at a site) contribute to overall community structure.

Here, we investigate the influence of single elements in a community matrix
on overall community nestedness. We derive a unique extension to the popular
nestedness algorithm NODF that is necessary for this analysis.

For 210 empirical communities, we show that elements, on average, determine a
little less than 50{\%} of a community’s nestedness value, with components
determining the remainder. Looking at just matrix elements we find, on average,
that 10{\%} of elements determine 25{\%} of a community’s nested structure. Further, we
find statistical conclusions change for more than 20{\%}of the empirical communities
with the addition or removal of a single element.

Generally, the search for ecological pattern occurs by calculating a single
metric designed to quantify the structure of an entire community. By showing the
sensitivity of a metric to changes in a single element, our results cast doubt on
the usefulness of this approach. That said, the extension to NODF that we present
should allow researchers to better understand how individual elements in a
community influence patterns of nestedness.